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SPONTANEOUS-POTENTIAL LOG [1 record]

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Record 1 2013-05-30

English

Subject field(s)
  • Geophysics
  • Geological Prospecting
DEF

A passive measurement taken by oil industry well loggers to characterise rock formation properties.

CONT

The log works by measuring small electric potentials (measured in millivolts) between depths in the borehole and a grounded voltage at the surface. Conductive fluids are necessary in bore hole to create a SP response, so the SP log cannot be used in nonconductive drilling muds (e.g. oil-based mud) or air filled holes.

OBS

Using the data from this log and from other electric logs the geologist is able to determine the nature of the formation being drilled through and assess its likely porosity and permeability.

French

Domaine(s)
  • Géophysique
  • Prospection géologique

Spanish

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